Welding rod



Patented a... 17, 1941 WELDING ROD John W. Bolton, Hamilton, Ohio, assignor to The I Lunkenheimer Company, Cincinnati, Ohio, a

corporation of Ohio No Drawing. Application February 2, 1940,

Serial No. 311,005

6 Claims.

It is'the object of my invention to provide weld I ing rods that will produce a hard, corrosion resistant, wear resistant alloy coating applied by I and which can be deposited over large areas without cracking, either as deposited or after rinding.

It is a further object to provide such'aweld that by age hardening heat treatmentcan be hardened to approximately 650 Brinell;

It is an an object to provide such a weld of this hardness that is not excessively fragile or brittle.

It-is a further object to provide a ternary 1 alloy metal welding rod of the composition of nickel, chromium and silicon in the approximate proportions of 6% to 12% silicon, 9% to chromium, and the balance nickel.

Stated another way, the ratio of nickel to chromium should not be more than 10 to 1 and not less than-2 to 1. A ratio of nickel tochromium in the approximate ratio of 4 parts of nickel to 1 part of chromium with silicon added within the approximate range of 6% to 12% pro- I duces a satisfactory alloy.

The greater the amount of silicon, the higher the range of hardness. For instance, with silicon at 6% the Brinell number is 470, while, if the silicon is increased to 10%, the Brinell number rises to 601.

We have found that excellent commercial casta ing has such typical proportions at 71.8% nickel,

17.9% chromium and 10% silicon. I

The alloy of my invention is cast into thin wear resistant weld that is not brittle or fragile and which has the valuable property of being capable of being readily cast in rods and other similar long, thin sections.

This welding'rod can be utilized for giving a I hard, corrosionresistant surface to metal members, thereby making it possible to utilize large bodies of structural metal of cheap character that are not corrosion resistant and are not hard by coating them with the material of this alloy or this welding rod. I

It will be understood that I desire to comprehend within my invention such modifications as come within the scope of the claims and the invention. I

Having thus fully .described my invention, what I.- claim as new and desire to secure by- Letters Patent is: I

1. A new article of manufacture for use as a welding rod to produce a'hard, corrosion resistant and wear resistant weld or coatingcomprising an alloy of'6% to 12% silicon, 9% to 30% chromium, and the balance nickel.

2. A new article-of manufacture comprisinga welding rod of nickel, chromium and silicon in the proportions of 6% to 12% silicon, 9% to 30% chromium, and the balance nickel, and further characterized by the factthat said welding rod when applied as -a welded m'aterialj-to other supporting metal can have said coating- I,

increased in hardness by age hardening heat treatment.

I 3. A new article of manufacture comprising a cast ternary alloy welding rod-of nickel, chromium and silicon, said silicon being in proportion of 6% to 12%, said chromium in the proportion of 9% to 30%, and the balance nickel. I

4. A new article of manufacture to produce a hard, corrosion resistant and wear resistant metallic part comprising an alloy of 6% to 12% sections such as welding rods, preferably by the use of a gas fired crucible which confers upon the alloy an unusual fluidity. I After casting, these I rods are air quenched. The hardness of the ascast rod and the weidingvdeposit therefrom is approximately 500 Brinell. After it is deposited the welding layer can be heat treated to increase 'thetofrom600to6503rinell. This age hardening heat treatment is usually within a temperature range of from 900 F. to 1100 F., for a period of from four to sixteen or more hours asmaybedesired.

The welding rod of this invention is a cellular eutectic structure in a solid solution matrix. The alloy is relatively cheap and produces a hard.

to 30%. and the balance nickel. f

silicon, 9% to 30% chromium, and the balance nickel.

5. A new article of manufacture comprisinga,

cast ternary alloy of nickel, chromium and 1 con, said silicon being in the proportion of6.%" to 12%, said chromium in the proportion of 9.'%

6. An article made from an alloy and suitable for use as a welding rod, valve seating materials,

and other metallic parts and capable of with i I standing severe surface conditions of temperaj ture, pressure and. corrosion, comprising a cast";

ternary alloy of nickel, chromium and silicon,

said silicon being in the proportion of 6% to I of 9%to' I 12%. said chromium in the proportion 30%. and the balance nickel.

ions w. Bowen. '1 

